Measuring and testing – Instrument proving or calibrating – Volume of flow – speed of flow – volume rate of flow – or mass...
Patent
1982-12-02
1985-01-01
Gill, James J.
Measuring and testing
Instrument proving or calibrating
Volume of flow, speed of flow, volume rate of flow, or mass...
324166, G01P 350, G01P 2102, G01C 2202
Patent
active
044910070
ABSTRACT:
The present invention describes an adjustable speedometer/odometer to accommodate various vehicle drive configurations such as a variety of vehicle tire size and rear axle ratios. The range adjustment is made at the factory or by service personnel, and is implemented by a plurality of switches, insuring a positive selection of the desired range value, thereby eliminating the need for calibration. The conventional mechanical speedometer/odometer and speedometer cable are replaced by a signal transducer mounted on the transmission, and an electronic speedometer unit. The transducer sends signal pulses to the electronic speedometer unit that displays the vehicle speed and distance travelled, by a moving-magnet meter and an incremental counter, respectively. In addition, the range of the speedometer/odometer is switched to accommodate a dual-axle ratio differential according to a signal from an axle mounted switch. The speedometer/odometer range value is changed according to a constant proportion representing the difference in the two axle ratios. Moreover, the present invention is adaptable to receive signal pulses derived from a variety of vehicle locations, and is adaptable for other indicator applications, such as a tachometer.
REFERENCES:
patent: 2613071 (1952-10-01), Hansel
patent: 3441943 (1969-04-01), McCue et al.
patent: 3602817 (1971-08-01), Nilson
patent: 3614615 (1971-10-01), Cass
patent: 4140970 (1979-02-01), Graziano
patent: 4167699 (1979-09-01), Baker
patent: 4291268 (1981-09-01), Okuyama
"Moving Magnet Meter Movements"--Linear Application Update CLAU-324, Nat'l. Semiconductor Corp., Santa Clara, Calif., Feb. 1978.
"LM2907, LM2917", Linear Databook, pp. 9-80 to 9-92, Nat'l. Semiconductor Corp., Santa Clara, Calif. 1982.
Beede Electrical Instrument Co., Inc.
Gill James J.
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